Android: Update storage strings in site settings

Update the strings as requested by Chrome UXWs.
See the bug for instructions and context.

Bug: 638291
Change-Id: I910c2b13aae215dfd5c57111290c18a6a4c0b691
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756708
Auto-Submit: Michael Wasserman <msw@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687520}
3 files changed